• AGM plants

    AGM plants have been through a rigorous trial and assessment programme. They are:

    • Excellent for ordinary use in appropriate conditions
    • Available to buy
    • Of good constitution
    • Essentially stable in form & colour
    • Reasonably resistant to pests & diseases

Inula hookeri

Hooker inula

Hooker inula

© RHS 2002

  • Other common names Hooker inula

  • Family Asteraceae

  • Genus Inula may be annuals, herbaceous perennials or sub-shrubs, moslty with large basal leaves and daisy-like yellow flower-heads, often with narrow ray-florets

  • Details I. hookeri is a perennial forming a colony of erect, softly hairy stems to 75cm in height, bearing lance-shaped leaves and 1 - 3 light yellow flower-heads to 8cm across, in late summer and autumn

  • Plant range Himalaya

Characteristics

  • Foliage Deciduous

  • Habit Columnar/Upright

  • Hardiness

    Hardiness ratings

    All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

    • H1a - Under glass all year (>15C)
    • H1b - Can be grown outside in the summer (10 - 15)
    • H1c - Can be grown outside in the summer (5 - 10)
    • H2 - Tolerant of low temperatures, but not surviving being frozen (1 to 5)
    • H3 - Hardy in coastal and relatively mild parts of the UK (-5 to 1)
    • H4 - Hardy through most of the UK (-10 to -5)
    • H5 - Hardy in most places throughout the UK even in severe winters (-15 to -10)
    • H6 - Hardy in all of UK and northern Europe (-20 to -15)
    • H7 - Hardy in the severest European continental climates (< -20)

    H6

Colour

Sunlight

  • Partial Shade

  • Aspect East-facing or West-facing or North-facing

  • Exposure Exposed or Sheltered

Soil

  • Sand

    Sand

  • Loam

    Loam

  • Chalk

    Chalk

  • Clay

    Clay

  • MoistureMoist but well-drained

  • SoilSand, Loam, Chalk, Clay

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 0.5-1 metres

  • Ultimate spread 0.5-1 metres

  • Time to ultimate height 2-5 years

How to grow

Cultivation Grow in a deep, fertile moist but well-drained soil in partial shade. Can be invasive so site with care

Propagation Propagate by seed in pots in a cold frame in spring or autumn. Propagate by division in spring or autumn

Suggested planting locations and garden types Flower borders and beds Cut Flowers Cottage & Informal Garden Wildlife Gardens

How to care

Pruning Cut back after flowering

Pests Generally pest free

Diseases May be affected by powdery mildews

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